My 2c on the GTR. At normal driving speeds, the thing is in everyway inferior to the m3. Its noisy and clunky and it really is very boring to drive, the sensation of speed just isnt there at lower speeds.

of course that all changes for truly "spirited" driving.

If you mean the M3 is a better DD that's not much of a surprise but I just put the watch to my GTR yesterday and you can't tell me a stock M3 can touch a stock GTR. Turbos love cooler weather
Using a Racelogic Vbox: